When I did this with my friend we started the list with the physical things (e.g. tall) then moved onto "opposite of bad points about XP(s) (e.g. in her case "generous/not a miser" went on the list), then extra stuff that you really want.
So if DP didn't exist, I would probably put:
Medium or slim build
Blue or green or grey eyes
Interesting nice-looking face that makes me want to look at it for hours
Likes to stay up late talking (DP nods off at 11 :()
Initiates and participates properly in conversation (XP had a terrible "that's nice" habit)
Plenty of energy
Self-sufficient
A genuine adult, who I would trust with any task (i.e. a partner who can do things just as competently as you can)
Relaxed about previous relationships I have had
Willing and able to chat to and spend time with my friends and family
Employed, or likely to be employed at some point soon
Then the rest:
- competent and willing cook
- likes at least one of films/books/theatre
- not a porn user, at least not to my knowledge
- shares some key beliefs e.g. non-racist, non-sexist, not homophobic, generally not a bigot please
- kind to children and dogs
- doesn't take me too seriously (I am well scary)
- makes me laugh